EP2093840A1 - Connector, optical transmission module and optical-electrical transmission module - Google Patents

Connector, optical transmission module and optical-electrical transmission module Download PDF

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Publication number
EP2093840A1
EP2093840A1 EP09002357A EP09002357A EP2093840A1 EP 2093840 A1 EP2093840 A1 EP 2093840A1 EP 09002357 A EP09002357 A EP 09002357A EP 09002357 A EP09002357 A EP 09002357A EP 2093840 A1 EP2093840 A1 EP 2093840A1
Authority
EP
European Patent Office
Prior art keywords
contact point
section
plug
connector according
projecting terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09002357A
Other languages
German (de)
English (en)
French (fr)
Inventor
Yoshihiro Ishikawa
Shinichi Asano
Tomoe Toyoda
Takao Inoue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsumi Electric Co Ltd
Original Assignee
Mitsumi Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsumi Electric Co Ltd filed Critical Mitsumi Electric Co Ltd
Publication of EP2093840A1 publication Critical patent/EP2093840A1/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/10—Sockets for co-operation with pins or blades
    • H01R13/11—Resilient sockets
    • H01R13/113—Resilient sockets co-operating with pins or blades having a rectangular transverse section
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/77—Coupling devices for flexible printed circuits, flat or ribbon cables or like structures
    • H01R12/79—Coupling devices for flexible printed circuits, flat or ribbon cables or like structures connecting to rigid printed circuits or like structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
    • H01R13/639—Additional means for holding or locking coupling parts together, after engagement, e.g. separate keylock, retainer strap

Definitions

  • the present invention relates to a connector, optical transmission module and optical-electrical transmission module.
  • Circuits on a plurality of substrates in a mobile terminal are connected to one another by a film cable or optical transmission waveguide film to send and receive an electrical signal or optical signal.
  • the optical transmission waveguide film 100, etc. is connected to optical transmission modules 101 and 101 placed on each of the substrates (not shown) to connect circuits (not shown) on the substrates to each other.
  • an optical signal sending and receiving section, amplifying section and communication control section cased by an upper case 211 and a lower case 212 are mounted by fitting the above into the fitting section 120 of the connector main body 110.
  • FIG. 19B When mounting is performed, as shown in FIG. 19B , by allowing the socket contact section 121 provided in the connector main body 110 to be in contact from the side with the connection terminal 213 provided on a side face of the lower case 212, the optical transmission waveguide film 100 is electrically connected to an external terminal 122 through the optical signal sending and receiving section, etc., the connection terminal 213 and the socket contact section 121 to be connected to the circuit (not shown) on the substrate.
  • FIG. 19A shows an example where the optical signal sending and receiving section, amplifying section and communication control section of the optical transmission module 101 are each in a case separately. See Japanese Patent Application Laid-Open Publication No. 2007-286553 and Japanese Patent Application Laid-Open Publication No. 2007-157363 .
  • the optical transmission module 101 as shown in FIG. 18 , etc. can be manufactured in a compact form such that a length in a longitudinal direction is about 10 mm and a height from the substrate face is about 2 to 3 mm.
  • a length in a longitudinal direction is about 10 mm
  • a height from the substrate face is about 2 to 3 mm.
  • the size being smaller and thinner is strongly demanded, and the optical transmission module, etc. being even smaller and shorter in height is also demanded, however in the optical transmission module of the type shown in FIG. 18 , etc., it is not necessarily easy to make the size smaller and shorter in height.
  • the structure of the connector and the connector section of the optical transmission module need to be based on a new idea.
  • a main object of the present invention to provide a connector which can be smaller and shorter in height and to provide an optical transmission module and optical-electrical transmission module using such a connector.
  • a connector including:
  • an optical transmission module including the connector including:
  • an optical-electrical transmission module including the connector including:
  • an optical-electrical transmission module including the connector including:
  • a plug constituting a connector formed on one end of the film cable is described in the first embodiment.
  • the connector 1 of the present embodiment includes a receptacle 2 provided on a substrate (not shown) and a plug 3 connected to the receptacle 2.
  • the specification describes the embodiment using the terms up, down, horizontal direction, etc. based on when the base section 2a of the receptacle 2 extends in a horizontal direction and point 5a of a projecting terminal 5 is placed to project upward as shown in FIG. 1 .
  • the terms up, down, horizontal direction, etc. are to describe a relative relation of position of each member.
  • the direction describing vertical direction means the horizontal direction.
  • a projecting terminal 5 electrically connected to an external terminal 4 is provided in the receptacle 2.
  • the projecting terminal 5 is formed integrally on the external terminal 4 so that as shown in the cross-sectional view shown in FIG. 2 , one end of the external terminal 4 extending in a substantially horizontal direction is bent upward to form the projecting terminal 5, and the external terminal 4 and projecting terminal 5 form a substantial L-shape.
  • the projecting terminal 5 is formed so that widths of the projecting terminal 5 and the portion of external terminal 4 are even by insert molding. Forming the projecting terminal 5 with this method enables manufacturing at a low cost.
  • the electrical signal transmitted from the projecting terminal 5 to the external terminal 4 is reflected by the projecting portion B as shown in the dotted arrow in the figure, and thus causes transmitting efficiency of the electrical signal to decrease.
  • the projecting terminal 5 by forming the projecting terminal 5 so that the width is even, such reduction of the transmitting efficiency of the electrical signal can be prevented. Also, since an extra structure such as the projecting section B is not provided in the projecting terminal 5, the projecting terminal 5 can be formed slimmer, and a plurality of projecting terminals 5 can be placed with a narrower placement interval and the pitch can be made narrower.
  • the plurality of projecting terminals 5 are fixed to the receptacle 2 so that each point 5a projects upward from the base section 2a of the receptacle 2 and projecting positions of each point 5a are placed in a zigzag alignment on the base section 2a of the receptacle 2.
  • the plug 3 includes, a film cable 6 and a circuit substrate 7 fixed to one end of the film cable 6 and electrically connected to the film cable 6.
  • the circuit substrate 7 of the plug 3 is composed of, for example, a Flexible Printed Circuit (FPC).
  • FPC Flexible Printed Circuit
  • Contact points 8 are provided on the circuit substrate 7 of the plug 3 at each position corresponding to each point 5a of the plurality of projecting terminals 5 provided on the receptacle 2.
  • each contact point 8 is also placed in a zigzag alignment on the circuit substrate 7.
  • Each contact point 8 is each connected to each wiring (not shown) in the film cable 6.
  • the contact point 8 includes a hole 8b parted in a substantial H-shape by an elastic section 8a formed in two tongue piece shapes tip sections of which are facing each other. Also, as described later in FIG. 9A to FIG. 9C , the elastic section 8a of the contact point 8 are provided extending in a direction orthogonal to the inserting direction of the point 5a of the projecting terminal 5 provided in the receptacle 2. Incidentally, in each figure from FIG. 5 and after, other than the cross-sectional diagram and side-view diagram, the figures show a diagram where the plug 3 is viewed from above as in FIG. 1 .
  • the contact point 8 is formed so that thickness of the elastic section 8a of the contact point 8 is thinner than thickness of other portions of the circuit substrate 7. This is because, as described below, the elastic section 8a needs to be able to elastically deform when the point 5a of the projecting terminal 5 provided on the receptacle 2 is inserted in the hole 8b of the contact point 8.
  • circuit substrate 7 thick as in the present embodiment, deformation of the circuit substrate 7 can be prevented and the rising of the circuit substrate 7 from the receptacle 2 can be prevented.
  • a torsion preventing member 9 provided with an opening at a position corresponding to the contact point 8 is mounted to the circuit substrate 7.
  • the torsion preventing member 9 is formed by a member with rigidity such as a metal plate.
  • the circuit substrate 7 of the plug 3 is composed of a FPC.
  • the FPC is usually formed by applying a copper foil to an insulating layer such as polyimide, and there are various forms of such layered structure.
  • the elastic section 8a of each contact point 8 includes at least an insulating layer 8c with elasticity and a metal layer 8d for electrical connection provided on a face of the insulating layer 8c facing the projecting terminal 5, in other words, a bottom face of the insulating layer 8c.
  • the metal layer 8d is connected to each wiring of the film cable 6.
  • an insulating layer such as polyimide of the FPC composing the circuit substrate 7 is used in the insulating layer 8c of the elastic section 8a of the contact point 8.
  • the metal layer 8d is formed by laminating layers 8d2 and 8d3 of nickel (Ni), gold (Au) and the like respectively on a bottom face of a copper foil 8d1 composing the FPC by electrolytic plating.
  • the entire metal layer 8d of the elastic section 8a can be newly formed by a method such as plating the insulating layer 8c.
  • FIG. 5A and FIG. 5B an example is shown where the two elastic sections 8a of the contact point 8 are formed in a flat plate shape, however, as shown in FIG. 7 , the tip section of each elastic section 8a can be formed curved in advance in the inserting direction of the projecting terminal 5, in other words, upward.
  • FIG. 1 and FIG. 4 show the tip section of the elastic section 8a curved upward ( FIG. 4 is shown in a status turned over, therefore, in the figure, the tip section of the elastic section 8a is shown curved downward).
  • a wrong insertion prevention mechanism is provided to prevent wrong insertion such as mounting front and back of the plug 3 opposite when mounting the circuit substrate 7 of the plug 3 to the receptacle 2.
  • engaging concave sections 12 and 12 are provided to engage to the engaging convex sections 11 and 11 each provided facing inward on the short side wall section 10 and 10 of the receptacle 2 formed in a substantially rectangular shape from a plan view to align the plug 3 with the receptacle 2 and to prevent the plug 3 from escaping from the receptacle 2 in the extending direction of the film cable 6.
  • a wrong insertion prevention mechanism is formed where on the plug 3 side, a concave section 13 separate from the engaging concave section 12 is provided either on the left or right edge of the circuit substrate 7 and the torsion preventing member 9 mounted thereon in the extending direction of the film cable 6, and on the receptacle 2 side, a convex section 14 is provided facing inward on the short side wall section 10 of the receptacle 2 on a side where a concave section 13 on the plug 3 side is positioned when the plug 3 is correctly mounted to the receptacle 2.
  • a shield case 16 formed by metal material is provided on the receptacle 2 on the outside of at least the short side wall sections 10 and 10.
  • the shield case 16 is for shielding the projecting terminal 5 provided on the receptacle 2, a contact point 8 of the plug 3 connected thereto, etc., from an external interfering wave, and by shielding the interfering wave, normal electrical signal transmission through the above is maintained.
  • the shield case 16 can be composed to cover the bottom face or side wall of the long side where the external terminal 4 of the receptacle 2 is provided.
  • a shield cover 17 formed by metal material is mounted on the receptacle 2.
  • each shield case 16 on the receptacle 2 side is provided with a latching projection section 20 formed to project outward respectively.
  • the latching projection section 20 of the shield case 16 on the receptacle 2 side latches to the latching hole 19 of the shield cover 17 to lock the shield cover 17 to the shield case 16 and a lock mechanism is formed by the latching hole 19 and the latching projection section 20.
  • the shield cover 17 is locked to the shield case 16 to be reliably latched to the receptacle 2, the projecting terminal 5 provided on the receptacle 2, contact point 8 of the plug 3, etc. (see FIG. 1 , etc.) are shielded from external interfering waves and normal transmission of electrical signal through the above is maintained. Also, since the projecting terminal 5 is inserted in each contact point 8 of the plug 3 and the engaging convex section 11 of the circuit substrate 7 of the plug 3 and of the torsion preventing member 9 is engaged to the engaging concave section 12 of the receptacle 2, the plug 3 escaping from the receptacle 2 in the extending direction of the film cable 6 can be reliably prevented.
  • elastic holding sections 21 and 21 are provided on the shield cover 17 to elastically press the plug 3 from above when the shield cover 17 is mounted to the receptacle 2 so that each projecting terminal 5 provided on the receptacle 2 is reliably inserted in each contact point 8 of the plug 3 to make a further reliable electrical connection between the projecting terminal 5 and the contact point 8.
  • the elastic holding sections 21 and 21 are formed with two pieces stamped out in a U-shape at a position of a top face 22 of the shield cover 17 symmetrical with respect to an extending direction of the film cable 6 and the two pieces slightly bend downward. Also, each elastic holding section 21 and 21 contact and press a beam-like portion 23 of the torsion preventing member 9 provided between each column of each contact point 8 formed in two columns in a zigzag alignment on the circuit substrate 7 and the elastic holding sections 21 and 21 press each contact point 8 of the two columns front and back in the extending direction of the film cable 6 on the circuit substrate 7 through the torsion preventing member 9.
  • the elastic holding sections 21 press each contact point 8 of the plug 3 at a position symmetrical with respect to the extending direction of the film cable 6 or with respect to a line perpendicular to the extending direction of the film cable 6.
  • contact points 8 of the plug 3 are pressed evenly by the elastic holding section 21 and each of the projecting terminals 5 are reliably inserted in all of the contact points 8 and thus electrically connected reliably.
  • the elastic holding section 21 is to function as described above, and the number of elastic holding sections 21 formed is not limited to two.
  • the point 5a of the projecting terminal 5 provided on the receptacle 2 projecting upward from the base section 2a of the receptacle 2 contacts each contact point 8 of the circuit substrate 7 of the plug 3 from the bottom.
  • the point 5a of the projecting terminal 5 contacts the metal layer 8d of the elastic section 8a of the contact point 8 from the bottom.
  • the insulating layer 8c of the elastic section 8a of the contact point 8 is composed of material having elasticity such as polyimide, the insulating layer 8c elastically bends. In other words, if the projecting terminal 5 is pulled out, due to elasticity, the insulating layer 8c attempts to return to its original flat state, or when the tip section is formed curved upward in advance as shown in FIG. 7 etc., the insulating layer 8c attempts to return to this state. Therefore, as shown in FIG. 9B , the bent insulating layer 8c applies force so as to press the side face of the projecting terminal 5 from the side with its resilience.
  • the metal layer 8d of the elastic section 8a is brought into contact by pressure with the side face of the projecting terminal 5 and while the projecting terminal 5 is pushed into the contact point 8 of the plug 3 and moves upward relative with respect to the elastic section 8a, the side face of the projecting terminal 5 is substantially rubbed by the metal layer 8d of the elastic section 8a.
  • the metal layer 8d continues to be brought into contact by pressure with the side face of the projecting terminal 5, and the contact between the projecting terminal 5 and the contact point 8 through the metal layer 8d as described above is maintained.
  • the resilience due to the elastic deformation of the elastic section 8a of the contact point 8 enables the cleaning effect as described above and the projecting terminal 5 and the contact point 8 are reliably electrically connected. Also, by the above described resilience, the metal layer 8d of the contact point 8 is brought into contact by pressure with the projecting terminal 5, and the above described electrical connection is reliably maintained.
  • the effect of contact by pressure with the projecting terminal 5 by the metal layer 8d of the elastic section 8a or the cleaning effect described above when the projecting terminal 5 is inserted into the contact point 8 can be obtained even when the elastic section 8a is composed with only the metal layer 8d without providing the insulating layer 8c in the elastic section 8a of the contact point 8.
  • the thickness of the metal layer 8d of the elastic section 8a is only 10 ⁇ m to several tens of ⁇ m, therefore, when the elastic section 8a is formed with only the metal layer 8d, the metal layer 8d needs to be formed with some degree of thickness.
  • the elastic section 8a is composed of only the metal layer 8d
  • the metal layer 8d retains the shape bent upward as shown in FIG. 10A and the resilience of the metal layer 8d becomes weak or does not act.
  • the thickness of the metal layer 8d is made even thinner when the elastic section 8a is composed of only the metal layer 8d, then there is a case where the above described effect of contact by pressure with the projecting terminal 5 by the metal layer 8d of the elastic section 8a or the cleaning effect cannot be adequately obtained when the projecting terminal 5 is inserted in the contact point 8 and the electrical connection between the contact point 8 of the plug 3 and the projecting terminal 5 cannot be adequately obtained.
  • the metal layer 8d of the elastic section 8a is brought into contact by pressure with the projecting terminal 5 by the resilience due to the elastic deformation of the elastic section 8a of the contact point 8 to automatically and reliably connect the contact point 8 and the projecting terminal 5 electrically.
  • each contact point 8 of the plug 3 and each projecting terminal 5 can be formed in a compact form in an order of several tens of ⁇ m to several hundreds of ⁇ m where adequate and reliable electrical connection can be obtained and maintained and thereby the entire connector 1 can be made smaller.
  • the projecting terminal 5 is projected from the receptacle 2 to a degree where electrical connection with the contact point 8 of the plug 3 is secured, and in this case, the electrical connection can be secured and maintained adequately when projected in an order of several tens of ⁇ m to several hundreds of ⁇ m. Therefore, the thickness of the receptacle 2 and the plug 3 in the vertical direction can be formed adequately thin, and the entire connector 1 including the shield cover 17 can be made shorter in height to a thickness of about 1 mm.
  • the electrical connection between the metal layer 8d of the elastic section 8a and the projection terminal 5 is obtained and maintained by the resilience of the insulating layer 8c of the elastic section 8a of the contact point 8 of the plug 3.
  • the thickness of the insulating layer 8c is suitably determined so that a suitable resilience can be obtained.
  • the present embodiment describes an example where elastic sections 8a in two tongue-shaped pieces composing one contact point 8 are provided each extending in a square shape as shown in FIG. 5A , etc., however, for example, as shown in FIG. 11A , a corner section of the square-shaped elastic section 8a can be cut out in a tapered shape.
  • the present embodiment describes an example where tip sections of two tongue-shaped elastic sections 8a composing one contact point 8 are formed substantially parallel to each other as shown in FIG. 5A , etc., however, as shown in FIG. 11B and FIG. 11C , a plurality of portions of the tip section of the elastic section 8a can be formed in a saw-toothed shape including a plurality of projecting sections 8e projecting to the coupling elastic section 8a.
  • the insulating layer 8c and the metal layer 8d of the elastic section 8a are formed in a same shape.
  • the contact area between the metal layer 8d and the side face of the projecting terminal 5 is small when the metal layer 8d pressurizes to be in contact with the side area of the projecting terminal 5 (see FIG. 9C , etc.), and therefore, the pressure when pressurized becomes high.
  • the metal layer 8d of the elastic section 8a can be pressurized strongly by the projecting terminal 5 to be in contact with each other and the reliability of the electrical connection between the contact point 8 of the plug 3 and the projecting terminal 5 can be enhanced.
  • the second embodiment describes an example where a plug composing a connector is formed on one end of an optical transmission waveguide film and the plug mutually converts an electrical signal and optical signal to send and receive the signals.
  • an optical transmission module is formed by the connector. Therefore, below, the connector 30 can be read as the optical transmission module 30.
  • the connector 30 of the present invention includes a receptacle 31 provided on a substrate (not shown) and a plug 32 connected to the receptacle 31.
  • a projecting terminal 34 is provided electrically connected to the external terminal 33.
  • the projecting terminal 34 is formed integrated with the external terminal 33 in a substantial L-shape, and is formed by insert molding so that the width is even. Therefore, the transmission efficiency of the electrical signal transmitted inside and on the surface of the projecting terminal 34 becoming lower can be prevented and the projecting terminal 34 can be slimmer and the pitch can be narrower.
  • the projecting terminal 34 is fixed to the receptacle 31 so that the point 34a projects upward from the base section 31a of the receptacle 31. Also, in the present embodiment, the projecting position of each point 34a of a plurality of projecting terminals 34 is placed near an inner peripheral edge of the base section 31a of the receptacle 31.
  • the plug 32 includes an optical transmission waveguide film 35, circuit substrate 36, etc.
  • a protective cover 37 including metal material to function as a shield cover to shield from an external interfering wave is provided on the circuit substrate 36 so as to cover each electronic component, etc. of the later described circuit substrate 36.
  • the protective cover 37 is connected to a ground wiring of the circuit substrate 36 and also functions as a ground of the circuit substrate 36.
  • the protective cover 37 also has a function as a wrong insertion prevention mechanism to prevent wrong insertion of the plug 32 to the receptacle 31.
  • the protective cover 37 also has a function of allowing the projecting terminal 34 provided on the receptacle 31 to be inserted reliably to each contact point 38 of the circuit substrate 36 by pressing the circuit substrate 36 toward the receptacle 31 side to prevent the rising of the circuit substrate 36 by being pressed from the above with elastic holding sections 53 and 53 provided in the shield cover 45.
  • FIG. 13 is a perspective view showing a circuit structure of a circuit substrate of a plug.
  • FIG. 13 shows the plug 32 without the protective cover 37.
  • the circuit substrate 36 of the plug 32 is composed of for example, an FPC.
  • Contact points 38 are provided on the circuit substrate 36 of the plug 32 in each position corresponding to each point 34a of the plurality of projecting terminals 34 provided on the receptacle 31.
  • the structure, modification, function, etc. of the contact point 38 is the same as the structure (see FIG. 5A, FIG. 5B , etc.), modification (see FIG. 7 , FIG. 11A, FIG. 11B, FIG. 11C , etc.), and function ( FIG. 9A to FIG. 9C , etc.) of the contact point 8 of the first embodiment described above, therefore the explanation is omitted.
  • a torsion preventing member can be mounted on the contact point 38 of the plug 32 in the present embodiment also to prevent deformation such as torsion, etc. of the circuit substrate 36.
  • the thickness of the circuit substrate 36 itself is formed thick to prevent deformation such as torsion, etc. of the circuit substrate 36 or the rising of the circuit substrate 36 from the receptacle 31.
  • the thickness of an elastic section 38a of the contact point 38 is formed much thinner than the thickness of the other portion of the circuit substrate 36.
  • the thickness of the elastic section 38a of the contact point 38 is suitably determined to obtain suitable resilience.
  • the circuit substrate 36 of the plug 32 includes an electronic component 39 with a function such as converting the optical signal transmitted through the optical transmission waveguide film 35 to the electronic signal and converting the electronic signal transmitted through the projecting terminal 34 and the contact point 38 to the optical signal, wiring 40 to electronically connect each electronic component 39 and contact point 38, and optical signal sending and receiving section 41 to mutually convert the optical signal and electronic signal, to convert the optical signal transmitted through the optical transmission waveguide film 35 to the electronic signal, and to convert the electronic signal output from the electronic component 39 to the optical signal to output to the optical transmission waveguide film 35.
  • an extending section 36a extending toward the optical transmission waveguide film 35 side is provided on the circuit substrate 36.
  • a spacer 42 is provided between the optical transmission waveguide film 35, where one end is mounted to the top end of the optical signal sending and receiving section 41, and the extending section 36a of the circuit substrate 36, and the optical transmission waveguide film 35 is fixed to the extending section 36a of the circuit substrate 36 through the spacer 42.
  • the optical transmission waveguide film 35 can be prevented from moving relative to the circuit substrate 36 when external force is applied to the optical transmission waveguide film 35 at least near the circuit substrate 36 to accurately prevent the end of the optical transmission waveguide film 35 from disconnecting from the optical signal sending and receiving section 41 and not being able to perform sending and receiving of the optical signal.
  • a shield case 43 including metal material is provided covering the outer wall face of the side wall 44 of the receptacle 31 to shield the receptacle 31 from the external interfering wave.
  • the receptacle 31 is mounted with a shield cover 45 including metal material to shield the receptacle 31 from the external interfering wave.
  • each side wall section 46 is provided with a latching hole 47.
  • latching projections 48 formed projecting outward are provided on each shield case 43 of the receptacle 31 and when the shield cover 45 covers the receptacle 31 mounted with the plug 32, the latching projection 48 of the shield case 43 of the receptacle 31 latches with the latching hole 47 of the shield cover 45 to form a lock mechanism to lock the shield cover 45 to the shield case 43.
  • the shield cover 45 is provided with a latching section 49 formed by folding the end of each side wall section 46 on the shield case 43 side inward in an unguiform and the shield case 43 has a hole 51 drilled in each side wall section 50 corresponding to each side wall section 46 of the shield cover 45.
  • each of the unguiformed latching section 49 of the shield cover 45 is latched to each hole 51 of each of the side wall section 50 of the shield case 43 to compose a hinge section 52.
  • the shield cover 45 is openable and closable with respect to the shield case 43 by the hinge section 52.
  • the number of components can be made smaller compared to for example, as shown in FIG. 19A , where a different pin 300 is provided to connect the shield case 301 of the connector main body 110 and the shield cover 302 so as to be openable and closable.
  • the shield case 43 and the shield cover 45 can be easily and reliably mounted to the shield case 43 with the hinge section 52 so as to be openable and closable and the connector 30 (optical transmission module 30) can be made smaller and shorter in height.
  • the shield cover 17 can be mounted through the hinge section to the shield case 16 so as to be openable and closable.
  • elastic holding sections 53 and 53 are provided on the shield cover 45 to elastically press the protective cover 37 of the plug 32 from above to reliably insert each projecting terminal 34 provided on the receptacle 31 into each contact point 38 of the circuit substrate 36 of the plug 32 to reliably electrically connect the projecting terminal 34 and the contact point 38 when the shield case 43 is closed with the shield cover 45 and the plug 32 is mounted to the receptacle 31.
  • the elastic holding sections 53 and 53 include two pieces formed by stamping out a top face 54 of the shield cover 45 in a U-shape, which two pieces slightly bend downward. Also, in the present embodiment, the elastic holding sections 53 and 53 press positions on a top face 37a of the protective cover 37 symmetrical with respect to a center point O in a left and right direction and front and back direction of the extending direction of the optical transmission waveguide film 35 on the top face 37a of the protective cover 37 of the plug 32 when the shield cover 45 is closed.
  • each contact point 38 of the plug 32 are pressed evenly by the elastic holding sections 53 and 53 and each projecting terminal 34 is reliably inserted in all of the contact points 38 and are thus reliably electrically connected.
  • the protective cover 37 of the plug 32 also functions as a ground of the circuit substrate 36.
  • the protective cover 37 of the plug 32 is electrically connected to the shield cover 45 and, through the hinge section 52, the shield case 43. Therefore, the shield cover 45 and the shield case 43 also function as a ground of the circuit substrate 36 of the plug 32 and the grounding efficiency of the circuit substrate 36 of the plug 32 is further enhanced.
  • grounding projection sections 56 are provided by projecting a portion of an inner wall of each side wall section 46 of the shield cover 45 inward.
  • each grounding projection section 56 contacts each side wall section 50 of the shield case 43 to enhance electrical connecting efficiency between the shield cover 45 and the shield case 43 and with this, the grounding efficiency of the circuit substrate 36 of the plug 32 is further enhanced.
  • the connector 30 optical transmission module 30
  • the metal layer (not shown) of the elastic section 38a is brought into contact by pressure with the projecting terminal 34 with the resilience due to the elastic deformation of the elastic section 38a of the contact point 38 and the contact point 38 and the projecting terminal 34 are automatically and reliably electrically connected.
  • each contact point 38 of the plug 32 and each projecting terminal 34 can be formed in a compact form in an order of several tens of ⁇ m to several hundreds of ⁇ m where adequate and reliable electrical connection can be obtained and maintained and the entire connector 30 (optical transmission module 30) can be made smaller.
  • the projecting terminal 34 is projected from the receptacle 31 to a degree where electrical connection with the contact point 38 of the plug 32 is secured, and in this case, the electrical connection can be secured and maintained adequately when projected in an order of several tens of ⁇ m to several hundreds of ⁇ m. Therefore, the thickness of the receptacle 31 and the plug 32 in the vertical direction can be formed adequately thin.
  • the length in the left and right direction and the front and back direction of the extending direction of the optical transmission waveguide film 35 of the entire connector 30 (optical transmission module 30) can each be formed in an order of a few mm, and the connector 30 (optical transmission module 30) can be made smaller. Also, the thickness can be made shorter in height to about 1 mm including the shield cover 45.
  • the third embodiment describes an example where a plug composing a connector is formed on one end of the optical transmission waveguide film, the plug mutually converts the electrical signal and the optical signal to send and receive the signals, and the plug includes the FPC for electrical signal transmission.
  • the connector 60 can be read as the optical-electrical transmission module 60.
  • the connector 60 (optical-electrical transmission module 60) of the present embodiment and the connector 30 (optical transmission module 30) of the second embodiment have almost the same structure and the operation and effect are also the same, therefore, only points different from the connector 30 (optical transmission module 30) of the second embodiment will be described below. Also, members composing the connector 60 (optical-electrical transmission module 60) of the present embodiment which are members with the same function as those of the connector 30 (optical transmission module 30) of the second embodiment will be described by applying the same reference numerals as those used in the second embodiment.
  • the connector 60 of the present embodiment includes a receptacle 31 provided on a substrate (not shown) and a plug 32 connected to the receptacle 31.
  • the present embodiment is different from the second embodiment in that an extending section 36a of a circuit substrate 36 which supports through a spacer 42 an optical transmission waveguide film 35 connected to the plug 32 is further extended parallel to an optical transmission waveguide film 35 to form a FPC 61 for electrical signal transmission.
  • an inner structure of the plug 32 is similar to the first embodiment (see FIG. 13 ) and the circuit substrate 36 of the plug 32 is provided with each contact point 38, electronic component 39, wiring 40 to electrically connect each electronic component 39 and contact point 38, and optical signal sending and receiving section 41.
  • a plurality of wiring is provided on the FPC 61 for electrical signal transmission and is directly connected to a wiring (not shown) of the circuit substrate 36 of the plug 32 or is connected through the electronic component 39. Then, the electronic signal sent and received in the FPC 61 for electrical signal transmission can be transmitted directly or through the electronic component 39 to the contact point 38 and then sent and received to a projecting terminal 34.
  • the FPC composing the circuit substrate 36 of the plug 32 is formed thick to prevent deformation such as torsion of the circuit substrate 36 itself, however, the FPC 61 for electrical signal transmission needs to flexibly deform similar to the optical transmission waveguide film 35, therefore, the FPC 61 for electrical signal transmission is formed thinner than the circuit substrate 36.
  • the entire connector can be made smaller and shorter in height. Also, not only the optical signal but also the electrical signal can be sent and received together and the type of signal sent and received by the connector (module) can be many types and hybrized.
  • the plug 32 of the connectors 30 and 60 of the second and third embodiments after using the plug 32 with the shield cover 45 closed to reliably connect the plug 32 to the receptacle 31, the plug 32 can be caught in the receptacle 31 and difficult to take out when the shield cover 45 is opened to take out the plug 32 from the receptacle 31.
  • the plug 32 since the plug 32 is made very small, when the plug 32 is caught in the receptacle 31, it is difficult to take out.
  • the piece 70 is provided on the top face 37a of the protective cover 37 of the plug 32, fixed to the top face 37a only on one end.
  • the piece 70 can be composed of a metal piece, however, there is a possibility that such a piece will interfere the pressing of the protective cover 37 of the plug 32 by the elastic holding sections 53 and 53 of the shield cover 45 from the above, therefore, it is preferable that the piece 70 is formed by, for example, a tape-like material with flexibility. Also, it is more preferable if the piece 70 is placed so as to avoid the above described elastic holding sections 53 and 53.
  • the fitting of the plug 32 and the receptacle 31 can be released by pulling the piece 70 and the plug 32 can be easily taken out from the receptacle 31.
  • thin coaxial cables bundled or aligned on a plane can be used instead of the film cable 6 of the connector 1 of the first embodiment or the FPC 61 for electrical signal transmission of the connector 60 (optical-electrical transmission module 60) of the third embodiment.
  • a connector including:
  • the projecting terminal is formed substantially in an L-shape integrally with the external terminal and a width of the projecting terminal is formed even.
  • the plug includes a circuit substrate provided with the contact point.
  • a thickness of the elastic section of the contact point is formed thinner than a thickness of other portion of the circuit substrate.
  • the circuit substrate is composed of a flexible printed circuit.
  • the elastic section of the contact point includes:
  • a part or a whole of the metal layer is formed by electrolytic plating.
  • the contact point includes a hole parted in a substantial H-shape by the elastic sections formed to be two tongue piece shapes each tip section of which faces each other.
  • the tip sections of the elastic sections formed to be the two tongue piece shapes are formed substantially parallel to each other.
  • a plurality of portions of the tip sections of the elastic sections formed to be the two tongue piece shapes are formed in a saw-toothed shape projecting toward each other.
  • the tip sections of the elastic sections formed to be the two tongue piece shapes are formed curved in advance to the inserting direction of the projecting terminal.
  • the receptacle includes a shield case and a shield cover including a metal material.
  • an elastic holding section is provided on the shield cover to press the plug toward the side of the projecting terminal of the receptacle.
  • a grounding projection section in contact with the shield case is provided on the shield cover.
  • the connector further comprises a lock mechanism to lock the shield cover to the shield case by latching a latching projection section provided on the shield case to a latching hole provided on the shield cover.
  • the connector further comprises a hinge section including:
  • the plug includes a circuit substrate provided with the contact point, and a film cable electrically connected to the circuit substrate.
  • a torsion preventing member including rigidity provided with an opening at a position corresponding to the contact point is mounted to the circuit substrate.
  • a wrong insertion prevention mechanism is provided on the circuit substrate to prevent wrong insertion when the circuit substrate is mounted to the receptacle.
  • the plug includes:
  • the connector further comprises an FPC for electrical signal transmission.
  • the FPC for electrical signal transmission is formed thinner than the circuit substrate.
  • each contact point of the plug and each projecting terminal can be formed in a compact form in an order of several tens of ⁇ m to several hundreds of ⁇ m where adequate and reliable electrical connection can be obtained and maintained and the entire connector can be made smaller.
  • the projecting terminal is projected from the receptacle to a degree where electrical connection with the contact point of the plug is secured, and in this case, the electrical connection can be secured and maintained adequately when projected in an order of several tens of ⁇ m to several hundreds of ⁇ m. Therefore, the thickness of the receptacle and the plug can be formed adequately thin. Consequently, the thickness of the entire connector can be made shorter in height to about 1 mm.
EP09002357A 2008-02-20 2009-02-19 Connector, optical transmission module and optical-electrical transmission module Withdrawn EP2093840A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008038596A JP2009199809A (ja) 2008-02-20 2008-02-20 コネクタ、光伝送モジュールおよび光−電気伝送モジュール

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EP2093840A1 true EP2093840A1 (en) 2009-08-26

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US (1) US20090208168A1 (ja)
EP (1) EP2093840A1 (ja)
JP (1) JP2009199809A (ja)
CN (1) CN101515677A (ja)

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Also Published As

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US20090208168A1 (en) 2009-08-20
JP2009199809A (ja) 2009-09-03

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